How to I replace the cabin air filter in my 2008 MC C300

Question edited for clarity.
Question moved to category.

Apparently not, engine air filter only.

https://www.google.com/search?q=2008+ford+econoline+replace+cabin+air+filter

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I have a 2008 Grand Caravan and it states that the cabin air filter is behind the glove compartment, so like you I remove the glove box and nothing. I called the dealer and was told that on some models even though they say there is a cabin air filter in actuallity there is none

Good luck,

Marty

Check drain and unclog if required.
Remove air cabin filter (see you tube for instructions). Make sure it is done in a clean place so no dust or dirt gets in while you do this.
Block Air Cabin filter opening with duct tape.
Set fan to 50% (3/4), temperature to minimum
AC must be OFF
Open hood and using a Spray bottle, spray half a bottle of Alcohol 70% into the air intake vents at bottom of windshield
Turn off fan
Let it sit for 30 to 60 min
Set temperature to max and fan to max
Open hood and using a Spray bottle, spray the second half (250ml) of a bottle of Alcohol 70% into the air intake vents at bottom of windshield.
Turn heater and fan OFF
Take off duct tape and replace the air cabin filter (new one is better)
If you don't take off the air cabin filter, a lot of the alcohol or disinfenctant (like Lysol) may be stuck in the filter causing an irritating smell.
Replace Air cabin filter if possible.

The cabin dust & polen air filter location & replacement


The cabin air filter is placed inside the car under right dash panel near windscreen. See pictures below:

1. The Mercedes-Benz C-Class line of compact vehicles provides the German brand with a price point model for showrooms. The C-Class enjoys the trickle down effect of the innovations launched in more expensive Mercedes models such as the E-Class and the S-Class. The W204-bodied C300 was introduced for the 2008 model year and remains in production with the same specifications as of the 2011 model year.
Drivetrain
2. The Mercedes-Benz C300 is powered by a naturally aspirated, V6 engine with 3.0 liters of displacement. This motor has a 24-valve double overhead cam (DOHC) design with a 3.46-inch bore, a 3.23-inch stroke and a compression ratio of 11.3:1. Output for this engine is rated at 228 horsepower at 6,000 rpm and 221 pound-feet of torque at 2,700 rpm. Mercedes offers this compact luxury sedan with a choice of a six-speed manual or a seven-speed automatic transmission.
Exterior Dimensions
3. The C300 sits on a 108.7-inch wheelbase with an overall body length of 182.3 inches and width of 69.7 inches. The C300 Sport model has an overall height of 56.3 inches with a 60.4-inch front track and a 59.6-inch rear track, while the C300 Luxury model is 56.9 inches high with a 60.7-inch front track and a 60.8-inch rear track. Both trim levels of the Mercedes-Benz C300 offer 35.6-foot turning diameters.
Interior Dimensions
4. The Mercedes-Benz C300's cabin provides 88.2 cubic feet of passenger space with a trunk that offers 12.4 cubic feet of luggage room. Front-seat occupants are provided 37.1 inches of headroom, 41.7 inches of legroom, 54.7 inches of shoulder room and 52.3 inches of hip room. Rear-seat passengers are afforded 36.9 inches of headroom, 33.4 inches of legroom, 55.1 inches of shoulder room and 54.9 inches of hip room.
Safety
5. The National Highway Traffic Safety Administration (HTSA) frontal impact crash test resulted in four-star ratings (out of a possible five stars) for driver and passenger protection. This vehicle also earned a four-star rating in the NHTSA's rollover test, while the administration's side impact crash test resulted in five-star ratings. The Insurance Institute for Highway Safety (IIHS) frontal offset impact crash test earned the C300 a "Good" overall rating, which is the highest rating given by the IIHS.

have you cleaned or replaced your in cabin air filter? check your owners manual for directions.

See if this helps -
Say it's kind of a pain.
Volvo S80 ACC Cabin Air Filter

The cabin air filter on this vehicle should be located behind the glovebox.You will need to remove the glovebox to get to the access panel for the cabin air filter.Pull the cover off which usually consists of a few clips.Slide the filter out and you are ready to reinstall.

under hood,over battery, when facing windsheild top left by firewall

It is under the hood on the passenger side.